Pump for evaporating systems



March 9,1943. P. B. SADTLER 2,313,269

' I PUMP-FOR EIWAPORA'TINGJSYSTEM Filed se t. s, 1940 MINIMU M INVENTOR PHIL/P B. SADTLER V C5 ATTZRNEYJ Patented Mar. 9, 1943 PUMP FOR EVAPORATING SYSTEMS Philip B. Sadtler, Birmingham, Ala., assignor to Goslin-Birmingham Manufacturing Company, Inc., a corporation of Alabama Application September 3, 1940, Serial No. 355,125

1 Claim.

Fig. 3 is a diagrammatic view of a multiple effect evaporating system embodying my invention. Referring to the drawing, I show in Fig. 1 two elfects l and i I of a multiple effect system.

the provision of means in apparatus of the char- 5 Steam is admitted into the calandria of the effect acter designated by which a predetermined minil9 through a steam conduit 12, and vapor from mum head is maintained in the intake sides of the effect l0 passes through a conduit I3 to the the pumps. calandria of the eifect ll, as is Well understood. A more specific object of my invention is to iquor being evaporated passes in series through provide, in an evaporating system, a bypass con- 10 the efiects, being initially admitted to the efiect nection from the discharge to the intake side of II through a conduit I4. Connected to the upper a transfer pump, and float control means in comend of each of the effects l0 and II is a conduit munication with the intake side to vary come d g o e intake d Of a transfer p p m ni ati through th bypass, l1 associated with each of the effects and located In multiple effect evaporating systems, there preferably at a lower level than its associated is usually associated with each eifect a transfer effect. The p p I1, is driven by a motor l3 and pump adapted to pump the liquor discharged from discharges the liquor thwugh a d sc e 0 that effect to another effect, usually the next pred t 9 le din t h n t p din t, n ceding ffect, In rd t nt m th flow from the direction of steam flow. Inasmuch as there the pump, it has heretofore been the practice to s a higher ap r pressure in the next p eceding interpose a valve in the discharge line from the effect, th tr n fer pu p is d ar n l quor pump whereby the discharge may b re tr t against a higher head than that on the intake and such load thereby imposed upon the pump as Side of the p pec ing the intake conduit to slow down the discharge. Such an arrangen dischuge conduit is a bypass conduit ment does not prevent cavitation, and does 2|, in which is located a valve 22 controlling the pose an additional load on the pump, consuming flow of hquor through the bypassan undue amount of power and involving unnec- The,v alve 22 1S Operatedby float confirm means essary wear on the pump, due to the additional COmPmmg, fl member 23 located m frictionanoad 0 her 24 WhlCh is connected to the intake conduit I have discovered that cavitation may be prei' meagls condults 26 and h vented with a much less expenditure of power mem 13 secured to rod Whlch 1s pivoted at 28 in the chamber 24 and is connected and much moie satisfactory performance of the b y means of a link 29 with the valve 22, as shown pump, by leaving the discharge conduit wide open in Fig 2 It will be Seen that when th i and by providing a bypass between the discharge a5 k conduit '6 i b th Iquor n duit and intake conduit of the pump with e S a We 6 evel of the con float 23 and chamber 24, the float 23 moves upfioat controlled valve means in the bypass operwardly! closing the Valve 22, and all the liquor able by the liquor in the intake conduit to condischarged by the transfer pump passes 9 the flow 9 hquor through y a By through the conduit IE! to the next succeeding this means, I impose a predetermined minimum 40 fi t head on E Fmake Side of the pufnp Wh 1ch Should the liquor level fall below the chamber vents cavitation, while the unrestricted discharge 24, th float 23 falls, opening the Valve 22 and from e P p p s it to run ly Without permitting the liquor being discharged through consuming excessive power and without excessive the discharge conduit l9 toflow through t Wearpass conduit 2| into the intake conduit l6.

Apparatus embodying features of my invention Due to the higher vapor pressur in th fi t, is illustrated in the accompanying drawing forminto which each pump is discharging a ing a part of this application, in which pared with the pressure in the sheet from whi h 1 s an e io S ow y ti n apit is receiving liquor, the minimum head indicated plied to two efifects of a multiple efiect system, 54) on the drawing is lower than the head against omitting details of construction not necessary to an understanding of my invention;

Fig. 2 is a detail sectional view showing a float controlled valve mechanism adapted for use with my invention; and

which the pump l8 normally operates. Accordingly when the bypass valve 22 opens, there is insured a flow of liquor through the bypass 2| into the intake conduit l6, and the valve 22 functions to restrict that flow as the level rises duit 3|, and the succeeding efiects are connected by vapor conduits 32, 33, 34 and 35 respectively, the vapor from effect No. 5 passing through a conduit 36 to a condenser, not shown. Liquor.-

to be evaporated passes through the efiects in counter flow relation to the heating medium,

being introduced into efiect N0. 5ithroughia' 15 conduit 31. The liquor, therefore, in passing through the efiects, is subjected to an ascending pressure gradient. The transfer p umps I7, one of which is associated with each of the effects, cause the flow of liquor from effect to effectin series, being finally discharged through a. conduit 38, as shown. interposing the. float control bypass valve 22 between thefidischarge, and the intakeconduits of each of the pumps l1, afree flow of liquor is provided corresponding toi the rate of evaporation of each of the effects, with a minimum resistance to flow and with a reduction in power consumption and wear of parts as compared with evaporating systems heretofore known to me.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claim.

What I claim is:

In an evaporating system, a transfer pump, in take and discharge conduits connected to the pump, a bypass connecting the discharge conduit to the intake conduit, a valve in the bypass, and float control means in the intake conduit in advance of the bypass for operating the valve to vary the rate of flow through the bypass responsive to the head in said conduit.

PHILIP B. SADTLER. 

